That's the only thing that works.
An implicit tag for constructors to allow all implicit conversions would
really be helpful.
In general we need finer control of implicit conversions.
Just have a look at ProxyOf:
https://github.com/D-Programming-Language/phobos/pull/300/files#L0R2670
That's madness, all of that code just for getting alias this without
implicit conversion to the original type.